In Morrowind (still the best Elder Scrolls game in my book) I always horded Dwemer, Daedric, Glass and Ebony stuff. I loved hunting down artifacts as well. I'd always have several houses will all my loot displayed.

Actually thats a lie, money is a by product, I spend it to get high level weapons.

Actually, I never used to 'collect' anything in RPGs, I used to upgrade everything in SW:KOTOR but the lack of a decent storage/display system meant I got rid of everything. Mass Effect 2 and 3 don't really allow 'collecting' per se.

Only in Skyrim have I been collecting anything, and thats only because most vendors can't afford all my loot. I have full sets of light armour, heavy armour, ebony weapons, daedric weapons, dragonbone weapons etc.

But I find it quite satisfying that the game has racks and stuff to display your gear, a really really nice touch.

In Skyrim and i'll pretty much pick up anything that's useful, armour, weapons, potions, food.
I also seem to have an awful lot of various ores and ingots
In Fable I tend to collect clothes and jewelry a lot

In Fallout 3 I remember having shit tonnes of missiles, in the final battle I would wade in there with a missile launcher with a billion missiles, and the experimental fatboy with a thousand mini nukes or whatever.

I loved it in NV when they put a weight on ammo, so I started hoarding all my ammo in one of the footlockers in my room in the Casino place.

Yeah, I guess Fallout 3 is when I actually started 'collecting' things in RPGs. I never did anything like that in stuff like FF or KOTOR or even Mass Effect. In those games it was always biggest gun/best lightsaber wins.

In Fallout 3/NV/Skyrim its all 'what method of death should I take with me today?'